Detector for an optical-fiber acoustic sensor using dynamic holographic interferometry
It is shown that the acoustically induced phase modulation of coherent light propagating
within a multimode optical fiber may be linearly detected by an interferometer employing an
unmodulated replica of the fiber beam as the reference. It is proposed that a dynamic
hologram provide such a reference. This technique allows a performance comparable with
that of a monomode interferometric sensor to be obtained, but with considerably relaxed
alignment tolerances.
within a multimode optical fiber may be linearly detected by an interferometer employing an
unmodulated replica of the fiber beam as the reference. It is proposed that a dynamic
hologram provide such a reference. This technique allows a performance comparable with
that of a monomode interferometric sensor to be obtained, but with considerably relaxed
alignment tolerances.
It is shown that the acoustically induced phase modulation of coherent light propagating within a multimode optical fiber may be linearly detected by an interferometer employing an unmodulated replica of the fiber beam as the reference. It is proposed that a dynamic hologram provide such a reference. This technique allows a performance comparable with that of a monomode interferometric sensor to be obtained, but with considerably relaxed alignment tolerances.
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